'The Bachelor'Ditzy 'I Don't Read' Lawyer Kicks ASS In Court

1/15/2014 12:50 AM PST

Hot bachelorette Andi Dorfman REALLY sold herself short when she ditzily described herself as a lawyer who barely reads -- and TMZ has the proof ... video showing Andi kicking some ass in a huge murder trial involving a famous rapper and the Russian mob.

The court footage was shot Monday in Atlanta during a hearing for the trial of ex-mobster Mani Chulpayev, who's accused of playing a key role in the 2012 murder of rapper Lil Phat.

26-year-old Andi -- an Assistant District Attorney in the Fulton County DA's Office -- kills it.

Pretty shocking ... considering the way Andi presented herself on "The Bachelor" recently. "Legally Blonde" springs to mind -- and it raises the question ... Does a girl have to dumb herself down in order to attract a guy?